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Mathematical notation of convergence in latex

TeX - LaTeX Asked by SiXUlm on January 27, 2021

How can I type this notation in latex?
enter image description here

2 Answers

As Sigur mentioned in the comments you could use amsmath's xrightarrow{•}.

f_n xrightarrow{mu} f

Unfortunately this leads to a quite short arrow:

simple

There are multiple options to get a longer arrow. You could just add some space at the left and right. But this still leads to differently long arrows depending on the overset content.

f_n xrightarrow{enskipmuenskip} f
f_n xrightarrow{enskip L^penskip} f

with space

To prevent this you could use overset{•}{•} combined with a longrightarrow.

f_n overset{mu}{longrightarrow} f
f_n overset{L^p}{longrightarrow} f

overset

But in this case imho the arrow is still a little bit short. So the best way is probably to define a custom xrightarrow with a fixed width like this. Change the predefined value 2em to get a shorter or longer arrow.

newcommand{myrightarrow}[1]{xrightarrow{makebox[2em][c]{$scriptstyle#1$}}}‌

Which can then easily be used like this:

f_n myrightarrow{mu} f
f_n myrightarrow{L^p} f 

enter image description here

Correct answer by Benjamin on January 27, 2021

Building on Benjamin's answer, if anyone looking for how to get the text under the arrow, you can use [mu]{} instead of {mu}.

f_n xrightarrow[mu]{} f

Rightarrow 1

Similarly, if you want the arrows to be longer, you can add some space to either side

f_n xrightarrow[enskipmuenskip]{} f
f_n xrightarrow[enskip L^penskip]{} f

Rightarrow 2

Lastly, you could also get them the same size by using the longrightarrow

f_n underset{mu}{longrightarrow} f
f_n underset{L^p}{longrightarrow} f

Rightarrow3

Answered by Finn-Henrik Barton on January 27, 2021

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